I don't think I've ever heard anybody talk about actually using one but there are some videos on Youtube. I'm surprised nobody has restricted their use from civilians yet.
http://www.ammunitiontogo.com/catalog1/product_info.php?pName=9rds-12-gauge-flash-bang-ammo
http://www.ammunitiontogo.com/catalog1/product_info.php?pName=9rds-12-gauge-flash-bang-ammo